Display screen or portion thereof with a graphical user interface of an electronic device



FIG. 1 is a front view of a first embodiment of a display screen orportion thereof with a graphical user interface of an electronic device; and,

FIG. 2 is a front view of a second embodiment of a display screen orportion thereof with a graphical user interface of an electronic device.

In the figures, the outermost broken lines illustrate a display screen or portion thereof and form no part of the claimed design. The remaining broken lines illustrate portions of the graphical user interface that form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with a graphical user interface of an electronic device, as shown and described. 